Pipe and tool joint connection



Feb. 15, 1944. 1.. B. STINSON PIPE AND TOOL JOINT CONNECTION Filed Jan. 17, 1942 my. a

Leon .5. Stimson Patented Feb. 15, 1944 Leon B. Stinson,

My invention connection between a socket of a tool joint.

In securing a tool to Hughes Tool poration of Delaware Oklahoma City, Okla., assignor Company, Houston, Tex., a cor- Application January 17, 1942, Serial No. 427,087

3 Claims.

relates to the construction of a tapered pipe end andthe pipe section care must be taken to provide a I same. It is also necessary that the last engaged thread be protected against fatigue and'failure due to strains placed upon it resulting from bending, torque and vibration in use. Many different expedients have been adopted to accomplish these objects, some ing and some or which are to operate.

It is an objectoi connecting device and in which the It is also an object to i which are unavaildiflicult or expensive this invention to provide a which can be easily engaged thread itself is replaceable.

nection wherein the thread may be made particularly wear resistant.

I iurther aim to provide a threaded connection which W111 lead as may processes.

I also desire to provide a ment on both ends of the tight sealing engagethreaded area.

Further objects and advantages will become apparent from the description which follows together with the drawing, in which Fig. 1 is a side view partly in end engaged within the socket of showing a pipe a tool joint.

Fig. 2 is a broken vertical section section through a thread embodying the invention and in which the tool Joint is loosely made up.

Fig. 3 is a similar view tion tightly engaged.

Fig. 4 is a top the spring thread.

joint formed cylindrical except showing the connecplan view of the upper coil. of

member. The pipe I is at the end where it engages the tool Joint socket. There it is tapered slightly beginning at 2 and extending to the end vided which forms a sealing area. The extreme end of the pipe member The tapered portion is tance at 6 and beyond this the pipe is provided with a is beveled oil at 5. smooth for a short dissmooth sealing area spiral groove I to resecures the two parts ceive the spring threads 8 which form the connecting member.

The tool joint 9 is formed with a and gage the sealing area 4 upon the pipe. this tapered area the socket is tapered at l3 to the wall of the passage l4 through the member.

The spring 8 which forms the thread which together is preferably. square in cross section and of a length to fit Below down joint member 8, I form a projecting finger 15 which is adapted to engage within a recess in the end of the thread-receiving groove of the tool joint socket.

In the operation of fitting the pipe and tool joint in sealing relation it is contemplated that then inserted within the socket, the finger l5 fitting within a recess in the tool joint and the rethe tool joint and the outer surface of the spring 8, and a similar engagement at I! between the spring 8 and the inner wall of the groove 1.

obtained.

It will be noted that by forming the thread in this manner the-thread may be made of much harder material than is the and will thus be able to amount 01 wear in tool Joint or the pipe withstand a material use and will not easily call.

The spring member is Furthermore, this thread may be removed and replaced when desired without the necessity of renewing any of the other parts. The provision of the finger upon the larger end of the spring which forms the thread prevents the spring from creeping in the groove in the socket when the parts are being screwed together. Thus the spring will not be allowed to wind up and change its position in the groove and thus tend to bind therein. r

This type of joint may be connectedrtogether with ordinary apparatus which'may be easily handled in the field so that tool joints may be secured upon the pipe or removed therefrom without the necessity of heavy apparatus such as is now sometimes employed. As the spring thread member has a longitudinal play in the grooves longitudinal strain upon the threads will not injure or gall the same due to normal errors in lead in forming the grooves. What is claimed is: 1. A tool joint and drill pipe engaging device inbluding a tapered surface formed upon the end of said pipe. a spiral groove formed between the ends of said tapered surface and stopping short bf each end thereof, sealing surfaces at each end of said grooved area, a pipe-receiving socket formed in said tool joint, a spiral groove formed therein to register with the groove in said pipe end, a spiral spring thread fitting in said grooves and adapted to secure said pipe and tool joint tangular in cross against relative longitudinal movement, and sealing areas on said socket engaging the sealing surfaces upon said pipe said sealing areas being shrunk together.

5 2. In a tool joint and pipe connection, tapered areas on said pipe and said joint, registering spiral rectangular grooves on said areas, sealing surfaces at each end of the grooves on said tapered areas, and a spiral spring member recsection fitting within said grooves and serving as a thread to secure said tool joint and pipe together, said grooves being slightly wider than said spring whereby said spring fits loosely therein, whereby provision is 15 made for longitudinal shrinking when said joint I is shrunk upon said pipe.

3. In a tool joint and pipe connection, tapered areas on said pipe and said joint, registering spiral grooves rectangular in cross section on said areas, sealing surfaces at each end of the grooves on both pipe and joint, and a spiral spring member of hard metal fitting within said grooves and serving as a thread to secure said tool joint and pipe together, said grooves being slightly wider 25 than said spring so that when the joint is screwed tightly on said pipe, movementof said joint and pipe away from each other is prevented but slight movement of said pipe into said, joint is permitted.

30 LEON B. s'rmsou. 

